Proposed Haskell module namespace layout

This is a proposed standardised layout for Haskell libraries, using
the newly-proposed idea of module namespaces. It is intended firstly
to give a flavour of how namespaces can help in organising library
modules. I hope it is a reasonably convincing demonstration that
namespaces are a Good Thing.

Its second purpose is to prompt discussion of how we, the Haskell
community, would like to organise and develop our libraries towards
the goal of a "Standard" set, available on all compiler and interpreter
platforms. The particular layout shown here is a discussion-starter,
not a final state. (There are whole areas that I know very little
about, such as Algebraic and Numeric libraries, so there are bound
to be gaps.) But together, we must work to create a consensus on
naming issues like these.

The most important guiding principle, in my view, is:
Death to Misc and Utils!
Do not use a catch-all name for a category; only a little extra thought
is required to devise an informative name. Your users will thank you!